Characterization of a formaldehyde-free cornstarch-tannin wood adhesive for interior plywood

Published Date
Originals Originalarbeiten

First Online: 

01 December 2009

DOI: 10.1007/s00107-009-0379-0

Cite this article as: 

Moubarik, A., Allal, A., Pizzi, A. et al. Eur. J. Wood Prod. (2010) 68: 427. doi:10.1007/s00107-009-0379-0

Author and affiliations 

1. 1.SylvadourIUT des Pays de l’AdourMont de MarsanFrance
2. 2.IPREM-EPCP (UMR 5254)Université de Pau et des Pays de l’AdourPauFrance
3. 3.ENSTIB-LERMABNancy UniversityEpinalFrance

• Amine Moubarik
  • 1
  Email author
• Ahmed Allal
  • 2
• Antonio Pizzi
  • 3
• Fatima Charrier
  • 1
• Bertrand Charrier
  • 1

Author

Amine MoubarikEmail author

Ahmed Allal

Antonio Pizzi

Fatima Charrier

Bertrand Charrier

Abstract

This study investigated the physical properties (rheological and thermogravimetric analysis) of cornstarch-tannin adhesives and the mechanical properties (dry tensile strength and 3-point bending strength) of plywood made using cornstarch-tannin adhesives. This adhesive was evaluated for its utility in interior plywood manufacture. The optimum cure temperature and cure time of cornstarch-tannin adhesives were 170°C and 4 min, respectively. Plywood bonded with formaldehyde-free cornstarch-tannin adhesive exhibited excellent mechanical properties comparable to commercially available phenol-formaldehyde plywood adhesives. It was found that cornstarch-tannin panels which do not contain formaldehyde and with an emission equal to that of heated but unbound wood can be obtained by the use of hexamethylenetetramine (hexamine) as hardener.

The work has indicated that an environmentally friendly wood adhesive can be prepared from a natural renewable resource (cornstarch and wattle tannin) for bonding interior-type plywood.

Beschreibung eines neuen formaldehydfreien Maisstärke-Tannin Holzklebstoffes für Sperrholz im Innenbereich
Zusammenfassung

In dieser Studie werden die physikalischen (rheologische und thermogravimetrische Analyse) sowie die mechanischen Eigenschaften (Trockenzugfestigkeit und 3-Punkt-Biegefestigkeit) von Sperrholz, das mit einem Maisstärke-Tannin-Klebstoff hergestellt wurde, untersucht. Dabei wurde der Klebstoff bezüglich seiner Brauchbarkeit für im Innenbereich verwendetes Sperrholz untersucht. Die optimale Aushärtungstemperatur dieses Klebstoffes lag bei 170°C und die Aushärtungszeit bei 4 min. Sperrholz, das mit einem formaldehydfreien Maisstärke-Tannin-Klebstoff verklebt wurde, wies ausgezeichnete mechanische Eigenschaften auf, die mit denjenigen von handelsüblichen Phenol-Formaldehyd-Sperrholzklebstoffen vergleichbar sind. Es hat sich gezeigt, dass Maisstärke-Tannin-Platten, die kein Formaldehyd enthalten und deren Emission der von erhitztem, nicht verklebtem Holz entspricht, mit Hexamethylentetramin (Hexamin) als Härter hergestellt werden können.

Die Arbeit hat gezeigt, dass aus einem natürlichen nachwachsenden Rohstoff (Maisstärke und Akazientannin) ein umweltfreundlicher Holzklebstoff für die Verklebung von Sperrholz für den Innenbereich hergestellt werden kann.

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